copied this source from the following commit
 Forward port miscelaneous audio features

This commit adds:
 - Ascending ringtone (maniac103)
 - Silent mode
 - Volume panel style (ptunstall)
 - Link volumes
DvTonder authored 8 months ago

...

 On branch jb422
 Changes to be committed:
	new file:   res/layout/preference_dialog_increasing_ring.xml
	modified:   res/layout/preference_dialog_ringervolume.xml
	modified:   res/values/arrays.xml
	modified:   res/values/strings.xml
	modified:   res/xml/sound_settings.xml
	new file:   src/com/android/settings/IncreasingRingPreference.java
	modified:   src/com/android/settings/RingerVolumePreference.java
	modified:   src/com/android/settings/SoundSettings.java